Name and publication
Phytophthora mediterranea Bregant, Mulas and Linaldeddu (2021)
Bregant C, Mulas AA, Rossetto G, Deidda A, Maddau L, Piras G, Linaldeddu BT. 2021. Phytophthora mediterranea sp. nov., a new species closely related to Phytophthora cinnamomi from nursery plants of Myrtus communis in Italy. Forests 12 (6): 682.
refers to the Mediterranean region, where the species was originally discovered
Type: ITALY, Oristano, isolated from roots of a potted plant of Myrtus communis, 18 April 2019, isolated by Antonio Mulas, HOLOTYPE CBS H-24768, a dried culture on CA
Ex-type: culture CBS 147720 = CB84
Sequences for ex-type in original manuscript: ITS MW892398, ß-tubulin MW900443, cox1 MW900447
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology stellate on PDA, radiate on MEA, and cottony with no pattern on CA. Minimum growth temperature 10°C, optimum 32°C, and maximum 38°C.
Conditions for growth and sporulation
Sporangia were non-papillate, persistent, and predominantly ovoid to ellipsoid in shape with external proliferation. Sporangia averaged 43 x 30 µm (overall range 27–65 x 20–47 µm). Sporangiophores unbranched. Hyphal swellings present. Chlamydospores present, abundant.
Sterile in culture.
Most typical characters
Phytophthora mediterranea is separated from related species P. cinnamomi and P. parvisora by its higher maximum and optimum temperature value for growth.
Additional specimen(s) evaluated
ITALY: Oristano, isolated from rhizosphere and fine roots of a potted plant of Myrtus communis, 12 November 2020, isolated by Carlo Bregant; culture CB85
Hosts and distribution
Substrate: root and collar
Disease note: plants showed wilting foliage, chlorosis, stunted growth and sudden death symptoms in nurseries
Host: Myrtus communis
Additional references and links
Fact sheet author
Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University